Aerosmith’s “Global Warming” tour is in chaos, with sources exclusively telling Page Six that the band members are “barely speaking to each other.”

Further tension has erupted after their album “Music From Another Dimension” failed to sell as many copies as expected — fewer than Rod Stewart’s Christmas release — while their tour dates have not sold out.

Meanwhile, frontman Steven Tyler’s rocky engagement to fiancée Erin Brady still appears to be troubled, and his attorney and business manager, Dina LaPolt, has been busy filming a reality show pilot with the working title “Lipstick Law.”

A source told us, “The band isn’t really talking. Aerosmith’s record came in fifth after Taylor Swift [“Red”], ‘Now That’s What I Call Music: Volume 44,’ Rod Stewart’s ‘Merry Christmas, Baby’ and Ne-Yo’s new release [“R.E.D.”]. Pretty bad for their first release in a decade. No dates on the current tour are sold out. Meanwhile, LaPolt is doing a reality-show pilot instead of focusing on Tyler’s career, and his career needs help.”

The source added that Tyler’s engagement to Brady is in doubt “because she is never around.”

A second source told us, “Tyler is very unhappy about the reception of the album, and is blaming Columbia. Let’s face it, since Aerosmith fired manager Tim Collins, and John Kalodner as their A&R guy, they were never able to capture the magic from their ’80s comeback. Tim kept them clean and sober and invested their money, making them millions.”

But a spokesman for the band insisted, “Aerosmith is doing great and on tour and on fire. Any claim to the contrary is absolutely false.

“Also, Steven remains engaged to Erin. As the New York Post has been told before, just as any couple goes through trials and tribulations in a relationship, Steven and Erin have asked for their privacy at this time. It’s clear that someone is spreading false and malicious rumors, including stories about false tensions between Steven and Dina. To give them any credence would only empower them to disseminate more lies.”